| Gnamptogenys brunnea|
Nothing is known about the biology of Gnamptogenys brunnea.
- 1 Identification
- 2 Distribution
- 3 Biology
- 4 Castes
- 5 Nomenclature
- 6 References
A member of the porcata subgroup (in the striatula species group). This species is close to Gnamptogenys nigrivitrea on account of size, posteriorly tilted petiolar node, sleek appearance, subpetiolar process shape, sparse pilosity and lack of any trace of anterior petiolar peduncle. But nigrivitrea is different in its piceous body coloration with dark brown legs, lack of metanotal groove, slightly more elevated propodeal spiracles, longer pilosity, and a sleeker petiolar node with a more prominent apical point. (Lattke 1995)
Keys including this Species
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
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Not much is known about the the biology of Gnamptogenys brunnea. We can speculate that the biology of this species is similar to other species of the genus. Gnamptogenys are predatory ponerine ants that inhabit tropical and subtropical mesic forests. Nesting is typically at ground level in rotten wood or leaf litter. Some exceptions include species that are arboreal, a dry forest species and species that nests in sandy savannahs. Colony size tends to be, at most, in the hundreds. Queens are the reproductives in most species. Worker reproduction is known from a few species in Southeastern Asia. Generalist predation is the primary foraging/dietary strategy. Specialization on specific groups (millipedes, beetles, other ants) has developed in a few species.
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- brunnea. Gnamptogenys brunnea Lattke, 1995: 162, figs. 41, 42 (w.q.) COLOMBIA.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Holotype (Paratypes) measurements: HL 0.90 (0.88-0.92); ML 0.30 (0.30-0.32); HW 0.74 (0.68-0.80); SL 0.74 (0.80-0.84); WL 1.20 (1.10-1.28) mm; CI 0.82 (0.77--0.87); SI 1.00 (0.95-1.09); OI 0.18 (0.l6-0.l8) n = 5.
Cephalic dorsum longitudinally costulate; in frontal view vertexal margin concave and eyes slightly behind mid-length; mandibles triangular, with dorsal costulae, basal and apical margins with narrow smooth and shining strip that is sharply separated and lower than the rest of mandibular surface; anterior pronotal margin with 6-8 transverse costulae which arch around and become longitudinal on dorsum; mesometanotal suture well-impressed; mesonotum narrow and transverse; in lateral view dorsal propodeal face slightly depressed below rest of mesosomal dorsal margin; declivitous propodeal face distinctly separated from rest of mesosoma by low lateral ridges; mostly transverse costulae with longitudinal costulate from dorsum ex tending only to anterior one-fourth of declivitous face; petiolar node in lateral view transversely costulate and posteriorly inclined: a broad anterior convexity with sharp posterior drop and concave posterior margin; subpetiolar process shaped as an anteriorly projecting lobe; anterior postpetiolar face and sternum with transverse costulae, longitudinal on rest; costulae on the gastric tergum II finer than on preceding segment; metacoxal spine present.
Body with sparse decumbent pubescence and erect to suberect hairs; pubescence denser on legs; scapes with abundant decumbent pubescence, no erect or suberect hairs. Body reddish-brown and legs brownish-yellow.
HL 0.98; HW 0.86; ML 0.32; SL 0.84; ED 0.18; WL 1.44 mm; CI 0.88; SI 0.97; OI 0.21. Like workers with exception of usual caste differences.
Holotype worker. Colombia, Choco, 10 km SW San Jose del Palmar, Finca Los Guaduales, 760 m, 2-VI-1978, C. Kugler, leg. Deposited in Instituto de Zoologia Agricola. Paratypes; One queen and 18 nidotype workers. Queen and 6 workers deposited in Instituto de Zoologia Agricola. Two workers deposited in each of the following: Museum of Comparative Zoology, Los Angeles County Museum of Natural History, The Natural History Museum, MUSP, National Museum of Natural History.
The name comes from the Latin term for brown, brunneus.
- Lattke, J. E. 1995. Revision of the ant genus Gnamptogenys in the New World (Hymenoptera: Formicidae). J. Hym. Res. 4: 137-193 PDF (page 162, 163 figs. 41, 42 worker, queen described)
- Lattke, J.E., Fernández, F. & Palacio, E.E. 2007. Identification of the species of Gnamptogenys Roger in the Americas (pp. 254-270). In Snelling, R.R., Fisher, B.L. & Ward, P.S. (eds). Advances in ant systematics: homage to E.O. Wilson – 50 years of contributions. Memoirs of the American Entomological Institute 80: 690 pp. PDF